The pKN\((-1)\)  () is called the Mikhailov model by Gerdjikov and his collaborators [1]}, [2]}.
Its reduction gives rise to the FL equation (REF ).
The latter provides solutions to the
massive Thirring model,
which describes the theory of a massive fermion field coupled to a two-component vector field
interacting with itself via a Fermi interaction [3]}, [4]}.
